fvp-cca: Support trace toggle in acs tests

[zpzigi754]

This PR enables --trace-toggle option for ACS tests. The option allows specifying the range of instruction tracing with Arm's ToggleMTIPlugin, helping to debug a subtle symptom. For example, it helped me to analyze rmi_rec_enter, when it was not working. The instruction toggling is controlled by pre-reserved hlt 5 instruction.

[Pre-requisite]

The library (ToggleMTIPlugin.so) is not included in our simulator package. It should be manually located by installing another package such as FastModelsPortfolio_11.25 which requires license agreement.

[Usage example]

(in plat/fvp/src/entry.rs)
unsafe extern "C" fn rmm_entry() -> ! {
    core::arch::asm!("
        msr spsel, #1
        bl get_cpu_id

+       hlt     5                   // trace start
        ldr x1, =__RMM_STACK_END__
        mov x2, {}
        mul x0, x0, x2
        sub x0, x1, x0
        mov sp, x0
+       hlt     5                   // trace end

$ ./scripts/fvp-cca -nw=acs --selected-tests="cmd_rsi_version" --trace-toggle

$ cat out/trace.log
141120780000 ps cluster0.cpu0 IT (14112078) fdc0000c 58000161 O EL2h_rl : LDR      x1,0xfdc00038
141120790000 ps cluster0.cpu0 IT (14112079) fdc00010 d2a00202 O EL2h_rl : MOV      x2,#0x100000
141120800000 ps cluster0.cpu0 IT (14112080) fdc00014 9b027c00 O EL2h_rl : MUL      x0,x0,x2
141120810000 ps cluster0.cpu0 IT (14112081) fdc00018 cb000020 O EL2h_rl : SUB      x0,x1,x0
141120820000 ps cluster0.cpu0 IT (14112082) fdc0001c 9100001f O EL2h_rl : ADD      sp,x0,#0
141120830000 ps cluster0.cpu0 IT (14112083) fdc00020 d44000a0 O EL2h_rl : HLT      #5

[jinbpark]

FastModelsPortfolio_11.25 which requires license agreement.

Should we add this into our init script in the future? (like our init scripts downloads FVP)

[zpzigi754]

Should we add this into our init script in the future? (like our init scripts downloads FVP)

Good question. Installing FastModelsPortfolio_11.25 requires the user's click on the GUI window for the license agreement, so doing with init script seems hard to achieve (also I am not sure it is okay to do it). In addition, unlike FVP, downloading FastModelsPortfolio_11.25 requires the user's login on Arm account.